IntelFsp2Pkg/Tools/ConfigEditor: Fixed data difference issue

[yunhsiax]

Description

Problem Description:
load_default_from_bin() caused data difference
errors when loading fsp.bsf and fsp.fd,
due to multiple identical UPD signatures.
The original string search picked the first match, which could be the wrong region

Solution Implementation:
Updated GenYamlCfg.py to locate UPD data
by FFS GUID (FSP_T/M/S_UPD_FFS_GUID)
before searching UPD signatures.
This ensures correct region matching
and retains the old string search as a fallback.

• Breaking change?
  • Breaking change - Does this PR cause a break in build or boot behavior?
  • Examples: Does it add a new library class or move a module to a different repo.
• Impacts security?
  • Security - Does this PR have a direct security impact?
  • Examples: Crypto algorithm change or buffer overflow fix.
• Includes tests?

How This Was Tested

Run the ConfigEditor tool with the actual fsp.bsf and fsp.fd files for validation.

Integration Instructions

None

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